Cyanobacterial Threat on Freshwater Safety
A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Water Quality and Contamination".
Deadline for manuscript submissions: closed (31 December 2020) | Viewed by 7608
Special Issue Editor
Interests: Kinneret; Hula Valley; limnology; wetlands ecology; freshwater plankton and fish ecology; lake and watershed management
Special Issues, Collections and Topics in MDPI journals
Special Issue Information
Dear Colleagues,
Cyanobacteria are organisms that are distributed worldwide in aquatic ecosystems. Cyanobacteria are very common in inland aquatic ecosystems,. Among the 14 orders of filamentous and non-filamentous cyanobacteria (including benthic forms), there are 30 toxic compounds producer species. As of today, about seven biochemical groups of cyanobacterial toxins are known. The geographical distribution of cyanobacteria includes tropical, sub-tropical, and temperate global zones. The diversity, density, toxicity, and longevity are widely varied as a result of the physical (temperature, water mass motion, stratification–de-stratification–turnover changes, light intensity, etc.), chemical (nutrient availabilities, competition, allelopathic relations, etc.), and grazing (fish, zooplankton, large invertebrate, etc.) influences.
Under conditions of depleted inorganic nitrogen (ION), three common species of heterocystous–filamentous cyanobacterial nostocales have the advantage of nitrogen fixing. Nevertheless, a low N/P ratio alone is not the only indicator for cyanobacterial flourishing, which is mostly relevant when the ION concentration is lower than 0.05–0.10 ppm.
Freshwater bodies become globally more Eutrophic because of water scarcity and human demand enhancements. Therefore, drinking-water resources’ susceptibility to cyanobacteria blooms increase. The ultimate need to reduce cyanobacterial blooms by management has become crucial.
An upgraded confirmation of the appropriate operation aimed at nutrient dynamic changes as a guideline tool for management operation must be proposed. The removal of cyanobacteria aimed at clear water is efficiently implemented by chemicals, but decomposed cells release dissolved toxins without turbidity changes. These toxins deteriorate water quality, and their elimination is crucial. Public health implications should be criticized quite often, as follows: The level of not higher than 1 ppb of microcystin LR was fixed for drinking water. Is it still valid? Guidelines for other toxins are not yet available and are highly required.
The major function of this Issue is the renovation and upgrade of the ecological, toxicity, and chemical information of the eco-physiological traits and the public health implications of toxic cyanobacteria.
Prof. Dr. Moshe GophenGuest Editor
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Keywords
- Cyanobacteria
- Microcystins
- Water quality
- Ecophysiology
- Toxicity
- Nutrient management
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